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Gravitational Collapse and Disk Formation in Magnetized Cores

  • Susana LizanoEmail author
  • Daniele Galli
Chapter
Part of the Astrophysics and Space Science Library book series (ASSL, volume 407)

Abstract

We discuss the effects of the magnetic field observed in molecular clouds on the process of star formation, concentrating on the phase of gravitational collapse of low-mass dense cores, cradles of sunlike stars. We summarize recent analytic work and numerical simulations showing that a substantial level of magnetic field diffusion at high densities has to occur in order to form rotationally supported disks. Furthermore, newly formed accretion disks are threaded by the magnetic field dragged from the parent core during the gravitational collapse. These disks are expected to rotate with a sub-Keplerian speed because they are partially supported by magnetic tension against the gravity of the central star. We discuss how sub-Keplerian rotation makes it difficult to eject disk winds and accelerates the process of planet migration. Moreover, magnetic fields modify the Toomre criterion for gravitational instability via two opposing effects: magnetic tension and pressure increase the disk local stability, but sub-Keplerian rotation makes the disk more unstable. In general, magnetized disks are more stable than their nonmagnetic counterparts; thus, they can be more massive and less prone to the formation of giant planets by gravitational instability.

Keywords

Accretion Disk Gravitational Collapse Molecular Cloud Giant Planet Young Star 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

S. L. and D. G. acknowledge support from the Scientific Cooperation Agreement Mexico-Italy MX11M07: “The formation of disks and planets around young stars”. S. L. also acknowledges support from PAPIIT-UNAM IN100412. The authors thank Fred C. Adams, Anthony Allen, Michael J. Cai, Alfred E. Glassgold, and Frank H. Shu for a longtime enjoyable collaboration, and an anonymous referee for a detailed and thoughtful report.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Centro de Radioastronomía y AstrofísicaUNAMMichoacánMexico
  2. 2.INAF-Osservatorio Astrofisico di ArcetriFirenzeItaly

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